#include<iostream>
using namespace std;
int main(){
	int sum=0;
	int a[10]={2,4,6,8,7,24,57,42,76,86};
	for(int i=0;i<10;i++){
		sum+=a[i];
	}
	float k;
	k=(float)sum/(sizeof(a)/4);
	cout<<k;
} 
